5-03.web-serlvet和spring的整合讲解

 

 

 

 

 

\web-servlet-spring\src\  applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--xmlns xml namespace:xml命名空间-->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p ="http://www.springframework.org/schema/p"
       xmlns:context ="http://www.springframework.org/schema/context"
       xmlns:aop ="http://www.springframework.org/schema/aop"
       xmlns:tx ="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/aop
                           http://www.springframework.org/schema/aop/spring-aop.xsd
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd">

    <bean id="userService" class="com.gyf.service.impl.UserServiceImpl"></bean>
</beans>

 

 

 

\web-servlet-spring\web\WEB-INF\ web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <!-- 配置spring配置文件的加载路径-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <!--监听器-->
    <listener>
        <!--配置是 [/WEB-INF/applicationContext.xml]路径下的文件-->
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

 

 

 

 

 

web-servlet-spring\src\com\gyf\web\servlet  \ RegisterServlet.java

package com.gyf.web.servlet;

import com.gyf.service.IUserService;
import com.gyf.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/register")
public class RegisterServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //获取参数
        String username = request.getParameter("username");

        //调用service
        //service的创建，由spring创建,从spring的容器获取user
        IUserService userService = null;

        /*开发中，项目只需要加载一次spring的配置文件就可以了*/
        /*ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        */

        //取applicationcontext对象
        ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
        System.out.println(context.hashCode());
        userService = (IUserService) context.getBean("userService");
        userService.add(username);

        //响应
        response.getWriter().write("register success");
    }
}